Mellow Mullet
Masterpiece
Really great to know - it's fascinating what a large range in climate they will tolerate. Grand Rapids to South Florida! Amazing.
Anyway, I wouldn't bother with seeds too much. You can buy seedlings by the hundreds for pretty low cost and have them shipped bare root.
http://www.coldstreamfarm.net/bald-cypress-taxodium-distichum.html
They are pretty easy to grow from seed, you can have 12-16 inch seedling in in season if you start early. All of mine we grown from seed.
John